Özet:

The use of 3D printers in rapid prototyping and specialty manufacturing areas is increasing rapidly. In the melt deposition method (FDM), which is the most widely used 3D printer technology, polylactic acid (PLA) material is widely preferred. In order for 3D printing to be used in the production of usable parts beyond prototype or model production, it was necessary to improve the mechanical properties of the filaments used. For this purpose, it is important to develop reinforced composite filaments. In this study, the main purpose was to produce glass fiber reinforced PLA composite filament, which has particularly higher bending and impact resistance and to allow producing parts which can be used as a functional part by using a 3D printer. In the study, to produce composite granule, glass fiber powder (GF) were added by 5%, 10% and 15% to a thermoplastic PLA by using a twin-screw extruder. With these granules, 1,75 mm filament was extruded by using single screw extruder. In order to determine the mechanical properties of the 3D printed specimens, tensile test (ASTM D638), flexural test (ASTMD790) and impact strength (ASTM D6110) test performed. To determine the effect of the printing parameters on the mechanical properties of the printed specimens, three infill geometries (Grid, Rectilinear, Full honeycomb), three infill rate (10%, 50%, 90%) and two nozzle temperatures (190°C and 210°C) were used. Addition of GF to the PLA affected the mechanical properties of the printed parts. Adding 5% GF resulted in a 28% increase in tensile strength and a 24% increase in flexural strength. Adding 10% GF led an 8,6 % increase in Charpy impact strength. It was determined that mechanical properties decrease when the addition ratio of GFP increases to 15%. It was also determined that there was a direct proportion between infill rate and mechanical properties, but neither infill geometry nor nozzle temperature affected the mechanical properties, significantly.

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